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JPL Small-Body Database Browser
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249459 (2009 HT81)
Classification: Main-belt Asteroid          SPK-ID: 2249459
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1459778324415179 7.1678e-08  
a 3.178715573734543 6.5458e-08 au
q 2.714693564332678 2.2716e-07 au
i 4.039935823278006 9.7944e-06 deg
node 232.1847210791154 0.00012812 deg
peri 60.91574353058615 0.00013582 deg
M 229.7483728426089 5.3939e-05 deg
tp 2459349.456489272059
(2021-May-14.95648927)
0.00032605 TDB
period 2070.026624789397
5.67
6.394e-05
1.751e-07
d
yr
n .1739108065997104 5.3719e-09 deg/d
Q 3.642737583136407 7.5013e-08 au
  Orbit Determination Parameters
   # obs. used (total)      158  
   data-arc span      7061 days (19.33 yr)  
   first obs. used      1999-10-13  
   last obs. used      2019-02-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .63678  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-14 12:12:10  

Additional Information
 Earth MOID = 1.7009 au 
 Jupiter MOID = 1.55103 au 
 T_jup = 3.180 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.9   n/a MPO217804  
diameter diameter 2.971 km 0.449 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.115   0.058 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

249459 (2009 HT81)          Discovered 2009-Apr-24 by Cerro Burek at Cerro Burek
Reference: 20100824/Numbers.arcLast Updated: 2010-08-27

[ show close-approach data ]
Alternate Designations
 2009 HT81 = 2004 PW86 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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